Base Station Device, Data Transmission Control Method, and Data Transmission Control System

1. A base station device comprising: a receiving unit that receives an acquisition request for data group including a plurality of data from a terminal; and a transmitting unit that transmits, when the acquisition request is received by the receiving unit, data being included in the data group to the terminal, wherein while the transmitting unit is in the process of transmitting the data to the terminal by using a first transmission line and when an acquisition request for the data group which is requested by the terminal is received from another terminal by the receiving unit, the transmitting unit executes a first transmission and a second transmission in parallel, the first transmission transmitting, to both the terminal and the other terminal by using the first transmission line, data that has not been transmitted to the terminal among the data group, the second transmission transmitting, to the other terminal by using a second transmission line, data that has been transmitted to the terminal among the data group.

2. The base station device according to claim 1 , further comprising a determining unit that determines, on the basis of the amount of the data that has been transmitted and the amount of the data that has not been transmitted, whether data is transmitted to the other terminal by using the first transmission line, wherein when the determining unit determines that the data is transmitted to the other terminal by using the first transmission line, the transmitting unit transmits, to both the terminal and the other terminal by using the first transmission line, the data that has not been transmitted to the terminal and transmits, to the other terminal by using the second transmission line, the data that has been transmitted to the terminal among the data group, and when the determining unit determines that the data is not transmitted to the other terminal by using the first transmission line, the transmitting unit transmits, to the other terminal by using the second transmission line, the entirety of the data group.

3. The base station device according to claim 1 , further comprising a storing unit that stores therein data acquired from a server, wherein when data associated with an acquisition request that is received by the receiving unit is stored in the storing unit, the transmitting unit reads the associated data from the storing unit and transmits the read data and, when the data associated with the acquisition request is not stored in the storing unit, the transmitting unit acquires the data associated with the acquisition request from the server, transmits the acquired data to the terminal, and stores the acquired data in the storing unit.

4. The base station device according to claim 3 , further comprising a deleting unit that deletes data, from among the data stored in the storing unit and starting with the data that has been stored for the longest elapsed time.

5. The base station device according to claim 3 , further comprising a deleting unit that deletes data, from among the data stored in the storing unit, in ascending order of a value obtained by dividing the number of times the data is used by the elapsed time since the data is stored.

6. The base station device according to claim 3 , further comprising a deleting unit that deletes data, from among the data stored in the storing unit, in ascending order of a value obtained by subtracting the elapsed time since the data is stored from the retention period that is specified for each data.

7. A data transmission control method performed by a base station device, the data transmission control method comprising: receiving an acquisition request for data group including a plurality of data from a terminal; and transmitting, when the acquisition request is received, the data being included in the data group to the terminal, wherein while the data is being transmitted to the terminal by using a first transmission line at the transmitting and when an acquisition request for the data group which is requested by the terminal is received from another terminal at the receiving, the transmitting includes executing a first transmission and a second transmission in parallel, the first transmission transmitting, to both the terminal and the other terminal by using the first transmission line, data that has not been transmitted to the terminal among the data group, the second transmission transmitting, to the other terminal by using a second transmission line, data that has been transmitted to the terminal among the data group.

8. A data transmission control system comprising: a base station device; a first terminal; and a second terminal, wherein the base station device includes a receiving unit that receives an acquisition request for data group including a plurality of data from the first terminal and the second terminal, and a transmitting unit that transmits, when the acquisition request is received from the first terminal by the receiving unit, the data being included in the data group to the first terminal, that transmits executes a first transmission and a second transmission in parallel, while transmitting the requested data to the first terminal by using a first transmission line and when an acquisition request for the data group which is requested by the terminal is received from the second terminal by the receiving unit, the first transmission transmitting, to both the first terminal and the second terminal by using the first transmission line, data that has not been transmitted to the first terminal among the data group, the second transmission transmitting, to the second terminal by using a second transmission line, data that has been transmitted to the first terminal among the data group, the first terminal includes a transmitting unit that transmits the acquisition request for the data group to the base station device, and a receiving unit that receives, by using the first transmission line, the data that is associated with the acquisition request from the base station device, and the second terminal includes a transmitting unit that transmits the acquisition request for the data group to the base station device, and a receiving unit that receives, from the base station device by using the first transmission line, the data that has not been transmitted to the first terminal and that receives, from the base station device by using the second transmission line, the data that has been transmitted to the first terminal.